This invention relates generally to liquid dispensing electrical
and more particularly relates to such a toothbrush having an integrated toothbrush
and a refill assembly
and a liquid channel assembly
having one in the brush head area
includes located pump element. The pump element uses the
Effect of the moving brush head,
from the integrated container
to the bristles on the brush head
Background of the invention
The effective delivery of an oral dentifrice and / or medicament capable of inhibiting or killing bacteria responsible for dental disease has long been desirable and has been the subject of considerable research effort. A wide variety of devices, both active and passive, have been developed to deliver dentifrices or medicines to the bristles. Such devices have been developed for both manual toothbrushes and electric toothbrushes. Manual toothbrushes usually use a hand-operated pump as in the US Pat U.S. Patent Nos. 4,221,492
granted to Boscardin et al., and 4,413,370
whereas, electric toothbrushes utilize a variety of approaches, including integrated and external active pumping devices comprising various mechanical, pneumatic and hydraulic elements.
Some liquid dispensing systems for electric toothbrushes utilize the movement of the toothbrush itself to suck a dentifrice from the container to the bristles, such as in the US Pat U.S. Patent No. 5,309,590
, issued to Giuliani et al., is shown. Representative examples of fluid delivery systems for manual toothbrushes and electric toothbrushes include U.S. Patents No. 3,547,110
issued to Balamuth, 5,066,155
, granted to English, inter alia, 5,208,933
, given to Lustig, and 5,062,728
, assigned to Kuo.
The dentifrice container is usually either as in the U.S. Patent No. 5,309,590
shown in the handle of the toothbrush, or, as in the U.S. Patent No. 3,547,110
shown in a separate device. In some cases, the container is disposable such that when the liquid in the container is exhausted, the container itself is discarded and a replacement container inserted. Such a system is in the U.S. Patent No. 4,413,370
shown. In other systems, the container is refillable. Typically, the container contains sufficient liquid for a significant number of individual applications of the liquid dentifrice or medicament.
Various systems for dispensing the liquid from the brush head are also known. In some cases, the liquid, as in the U.S. Patent No. 4,221,492
shown discharged from a plurality of openings in the brush head itself, while the liquid in other cases, as in the U.S. Patent No. 4,039,261
, issued to Evans, shown dispensed through the bristles themselves.
Liquid dispensing systems
however, are generally common
hard to use, unreliable
and expensive. Many such systems are too complex to be reliable
work and / or unable to function properly while others
Systems partly due to clogging of the liquid lines
or outlet openings
or a poor pump performance fail. It is also difficult
construct a system with a pump that's small enough
to fit into a typical construction of a toothbrush. Often
used external pumps that are big and expensive. The pump element,
whether integrated or outside,
too complex for
a lasting, reliable one
Operation or too expensive to be usable. For all these reasons, fluid delivery systems are
as well as
as well as for
not very successful.
by virtue of
The potential benefits is a fluid delivery system in one
And yet it is designed simply enough that it is practical in the
Manufacturing and entertainment is.
The invention relates to an electric toothbrush with a fluid delivery system comprising a head portion and a grip portion, the head portion having a brush head portion and being detachable from the grip portion, the fluid delivery system comprising:
a liquid container adapted to be located in the head region of the electric toothbrush,
a pump element and associated fluid conduit for moving liquid from the container to the brush head portion of the head portion of the toothbrush, and
a dispensing member adapted to be located in the brush head, connected to the fluid conduit, and having fluid provided by the pump member allow fluid to exit near bristles located on the brush head.
Short description of the drawing
1 Fig. 12 is a schematic view showing a toothbrush embodying the fluid delivery system of the present invention.
2 is a partial exploded view of the head portion of the toothbrush of 1 ,
3 Fig. 10 is a schematic diagram showing a portion of the fluid delivery system of the present invention.
The 4A and 4B Figure 12 is a cross-sectional view of a refill valve of the fluid delivery system of the present invention with and without a refill needle therein.
5 is a partial exploded view showing the pump element and the brush head.
The 6 and 7 Fig. 4 are cross-sectional views showing the fluid movement between the container and the brush head containing the liquid moving pump element.
8th Fig. 12 is a cross-sectional view showing the discharge valve of the liquid supply system.
The 9 to 13 FIG. 4 is a diagram showing the refill assembly of the present invention and the process of refilling the integrated container of the toothbrush of FIG 1 demonstrate.
14 is a plan view of the refill assembly.
15 is a partial exploded view of an alternative embodiment of the pump element of 5 to 8th ,
16 is a cross-sectional view of the pump element of 15 ,
17 is another cross-sectional view of the pump element of 15 ,
18 is a cross-sectional view of the pump space portion of the pump element of 15 .
19 is a schematic representation of an upper portion of the pump element of 15 ,
20 is another cross-sectional view showing the pump chamber area of the pump element of 15 shows.
Best embodiment of the invention
1 shows a typical electric toothbrush in which the liquid dispensing and refilling system of the present invention is used. It should be emphasized, however, that the present invention is not limited to the illustrated and described special electric toothbrush or brush head movement. Rather, the principles of the present invention may be applied to a variety of electric toothbrush configurations and configurations, and some aspects of the invention may be used even in a manual toothbrush.
The generally with 10 designated electric toothbrush of 1 includes a grip area 12 and a removable head area 14 , In the grip area is a drive unit including an electromagnetic drive part and a battery for moving a brush head 18 which, as will be discussed in more detail below, is attached adjacent to a pivot arm. The toothbrush 10 is by means of a push-on / off switch 19 controlled.
is an exploded view, which are the main components of the head area 14
the toothbrush of 1
shows. The head area comprises two matching parts 22
of the body, which is a holding element 32
are joined together. The part 24
of the body includes a pulled out sign 26
for the brush head 18
, The brush head 18
is on a swivel arm 30
attached, which in turn so as to be between opposite sides of the retaining element 32
extending torsion pin pivot member 33
is fixed around that he can perform a pivoting movement. The swivel arm 30
is by an (not shown) electromagnetic drive part in the grip area 12
The toothbrush is driven on magnetic elements 36
at the end of the swivel arm 30
acts. Construction and operation of such a toothbrush are more detailed in the U.S. Patent No. 5,378,153
, assigned to Giuliani, which is held by the assignee of the present invention.
A rubber seal 38 and a plastic ring 40 seal the arm 30 at the parts 22 and 24 of the body, thereby preventing moisture from returning to the head area 14 arrives. A nut connection connects via a screw connection 15 the head area 14 with the grip area 12 , In an inner cavity 46 that of the two connected subareas 22 and 24 of the body is an integrated container 50 at orderly. The integrated container 50 is generally arrow-shaped, about 5.08 cm (2 inches) long, and has flexible, similar plastic front and rear walls joined together along their peripheral edges. The integrated container 50 In the illustrated embodiment, it usually holds sufficient liquid for a plaster application, ie, a "use unit." This relatively small volume of the integrated container is essential in that it provides a liquid container in the removable head region 14 the toothbrush construction of 1 can be arranged. This arrangement has several advantages, including a relatively short liquid transport path and a generally simple construction. Accordingly, if the head area 14 is replaced, for example, when the bristles of the brush head 18 worn out, both the container 50 and the associated fluid supply system part of the replacement unit.
In the 2 and 3 extends from the container 50 from a short tube section 52 which is in the lower end of a refill valve 56 fits, which is explained in more detail below. From the side of the refill valve 56 out extends above the entry point of the tube section 52 a flexible fluid line 60 which in the illustrated embodiment is a flexible plastic material having a diameter of about 0.25 inches (0.25 inches) and a length of about 1 inch (2.54 cm). The fluid line 60 closes to a liquid inlet nozzle 62 having a diameter of about 0.127 cm (0.05 inches) and at the proximal end 64 in the brush head 18 extends.
The 5 to 8th show the fluid delivery design in the brush head 18 that is a liquid pump 66 , one from the pump 66 in a base element 76 extending fluid supply cavity 68 and a liquid dispensing valve 70 extending from the feed cavity 68 out through the brush head 18 over the area 71 of the brush head up into the bristle area 72 the toothbrush extends comprises.
The liquid inlet nozzle 62 extends so far into the brush head 18 that he is the entry area 83 ( 7 ) of the liquid pump 66 touched. The liquid pump 66 is an irregular block of material with a cylindrical passageway extending laterally therefrom 75 , The liquid pump 66 located at one end of the elongated base member 76 , The elongated base element 76 is about 0.0762 cm (0.03 inches) thick and has a cut out or void area 68 up, away from the pump 66 out to about the other end 80 of the base element 76 extends. The cavity area 68 is about 0.0381 cm (0.015 inches) deep in the illustrated embodiment.
As in 5 represented, form the liquid pump 66 and the base element 76 in the illustrated embodiment, a unitary element extending into a mating cavity 77 in the lower surface of the brush head inserts. The cavity 77 is adapted to the ends of the cylindrical passage 75 in the pump 66 Reliably seal when the unit is properly in the cavity 77 is arranged. The fluid delivery cavity 68 connects the exit area 85 the pump 66 with the lower end of the dispensing valve 70 , One the cavity 68 in the base element 76 surrounding lip 84 touches a sealing surface 87 in the brush head when the unit of pump and base is in place, providing a fluid-tight seal around the cavity 68 arises. The cavity 68 thus serves as a liquid supply means that the pump 66 with the dispensing valve 70 combines.
The pump 66 is provided with opposite recessed corners, wherein the recessed areas each from the opposite open ends of the cylindrical passage 75 around adjacent corners of the block to a point about half way along the adjacent side of the pump 66 extend. This arrangement is most evident in the 6 and 7 shown. A ball 63 , which acts as a piston, moves in the cylindrical passage 75 , The entrance area 83 covers one end of the passage 75 while the exit area 85 the other end of the passage 75 covered. The exit area 85 closes to the fluid supply cavity 68 in the base element. It is thus a gapless liquid channel from the pipe 62 to the cavity 68 available. The ball 63 moves in the cylindrical passage 75 , causing a pumping action on the liquid entering the passageway 75 when the brush head moves from one side to the other during operation.
The right game between the ball 63 and the inner surface of the cylindrical passage 75 is for proper pumping with adequate fluid pressure to the valve 70 important. In the illustrated embodiment, the clearance is approximately 0.00381 cm (0.0015 inches).
In operation, during the exhaust stroke, when the ball is on the outlet or exhaust 85
for the passage 75
Fluid is moved to both the outlet area and around the piston to the inlet area 83
for the passage 75
too moved. During the return stroke of the piston (towards the inlet area 83
) forces the ge The dispensing valve closed the liquid to flow around the ball to the outlet area in preparation for the next outlet stroke. The flow rate depends in part on the amplitude of movement of the brush head and is thus dependent on the load of the toothbrush. Is the brush head system a resonance system, as in the U.S. Patent No. 5,378,153
described, the flow rate increases when the bristles touch the teeth. The pumping process takes place with or without dispensing valve at the end of the liquid channel and is self-priming in operation, ie it can be promoted air.
Due to the influence of the piston ball 63 , which moves back and forth in the passageway due to the reciprocating motion of the brush head, becomes liquid from the outlet portion 85 pushed out of the pump and can from the liquid tube 62 in the inlet area 83 reach. In the outlet area 85 Fluid moves around the corner of the pump block and along the adjacent side, bounded by the walls of the brushhead cavity into which the pump and base member are fitted. The liquid moves into the cavity 68 in the base element 76 into it, around a small deflector 92 near the end of the cavity 68 around, into the inner passage 94 of the base area 96 the dispensing valve 70 ,
The dispensing valve 70 is in 8th shown. The diameter of the inner passage 94 is approximately 0.1778 cm (0.07 inches). The valve 70 is 0.84 inches (0.34 inches) high in the illustrated embodiment. The valve 70 is known as the "duckbill valve" because it has two converging lip areas 98 and 100 at its free end 101 having. The two lip areas 98 and 100 are normally closed, ie compressed, to prevent leakage and / or backflow of liquid. By the reciprocating motion of the brush head and the action of the pump, liquid with sufficient pressure to the two lips 98 and 100 push apart, into the valve 70 The valve shown not only prevents the backflow of fluid, which is a possible source of contamination, but also helps the pump to operate by itself and the flow rate and speed are fixed.
The "duckbill valve" 70 is conventional, made of a flexible plastic, to open and close the lip areas 98 and 100 to facilitate. In the illustrated embodiment, the free end of the valve extends 70 about 0.4572 cm (0.18 inches) above the brush head base. It is located both longitudinally and laterally approximately in the middle of the bristles, although this is not required for proper operation of the system.
In operation, when the brush head 18 moved from one side to the other, so that the piston ball 63 between the inlet and outlet end of the cylindrical passage 75 moved back and forth, successively small volumes (about 0.00013 cm 3 ) of liquid from the container through the pump 66 and then to the dispensing valve 70 emotional. The lips 98 . 100 of the valve 70 Slightly diverge with each small liquid wave, but close again after the wave is over. The successive amounts of liquid are forced out into the bristle area and brought to the desired tooth area by the action of the moving bristles.
the bristle movement a continuous fluid intake (as a small, successive
following splashes) to the bristle area. This system has
different advantages over
existing systems. First, it prevents the continuity of hydration
(in the form of successive splashes or pulses) the
Effect that the liquid
during the brushing period
will, as is the case, if the liquid, be it a conventional
Dentifrice or an oral medication, at the beginning of the cleaning process
is administered. Second, with the present invention, the
Effectiveness of the liquid
there the liquid
can be transported directly to the area of bristle movement.
In the case of the special operation of the illustrated toothbrush, in the way and with the operating features, as in U.S. Patent 5,309,590
As shown, including frequency and amplitude, the effectiveness of the fluid (dentifrice or medicament) is often increased by the cavitation and other effects of the fluid produced by the bristle movement. In addition, there is the precise transport of fluid to specific areas of the mouth of interest, including the gum areas at the gum line and between the teeth.
Consequently, the fluid delivery system of the present invention is not only practical and reliable, but also has significant therapeutic efficacy when used under selected conditions of use, such as those caused by the action of the toothbrush as described in U.S. Pat U.S. Patent No. 5,309,590
As indicated above, the container has 50 in the illustrated embodiment, a volume for a use unit, ie, the volume is sufficient for a cleaning operation of usual length, ie about two minutes. The system of the present invention also includes a refill system for the use unit container. The refill system is in the 9 to 14 shown.
9 shows the refill device 102 Generally used with the toothbrush of 1 to use. To refill the container designed for a use unit 50 in the head area of the toothbrush becomes the refill device 102 placed over the upper end of the toothbrush with the head portion and brush head portion of the toothbrush facing up into the interior of the refill 102 extend. The refill device includes a housing 104 with a viewing window 106 , which shows an area of the interior of the refilling device, so that the user can determine whether the toothbrush is inserted correctly.
10 shows the different areas of the refill. It includes the housing 104 and an inner core element 110 , The core element 110 includes a lower area 112 which is adapted to receive and connect to an upper portion of the head portion of the toothbrush. The brush head 18 extends through an opening 114 in the core element 110 up. The core element 110 has opposite side rails 116 and 118 on, which is on its outside 119 from a lower edge 117 of the core element extend upward. The rails 116 and 118 engage in corresponding (not shown) channels that form the counterpart to the inside 120 of the housing 104 one.
In this arrangement, the core element can 110 Reliable over a defined distance in the housing 104 move up and down without turning or moving from one side to the other. From the top of the lower area 112 of the core element 110 from upwards extends a narrow, elongated element 122 with a horizontal approach 124 at the upper end thereof and, adjacent to the top of the lower portion, two spaced wing members 126 and 128 at the base of the same. The lower area 112 of the core element 110 includes at its upper end, adjacent to the wing element 128 , also a flat surface area 130 , Through this flat surface area 130 go a small opening 132 therethrough. The opening 132 Conveniently and easily picks up a refill needle of the refill.
Above the core element 110 is a pump assembly 140 arranged inside a refill container 111 contains. Inside the pump assembly 140 is a filling needle 142 arranged, which is oriented vertically, wherein the base region 141 the needle on a gasket set 144 is fixed, the sealing, the inner peripheral surface of the pump chamber in a pump room area 145 the pump assembly 140 fits. At the top of the pump assembly 140 there is an opening 150 that with the refill container 111 in the pump assembly communicates. An upper element 154 snaps on an upper edge 156 the pump assembly 140 one. In the middle of the upper element 154 there is a well-shaped area 158 whose bottom is a (in 10 partially shown) opening 160 which, depending on the rotational position of the upper element with the opening 150 in the pump assembly is made to coincide or is not brought to coincidence. The refill container 111 can through these two openings 160 and 150 be filled when the upper element is in the correct position, so that cover the two openings.
The 11 to 13 are cross-sectional views illustrating the sequence of steps of refilling the container 50 for a use unit in the toothbrush. In 11 the toothbrush has just been placed in the refill, with the core element 110 located at its lowest position. In this position, the approach remains 124 of the stretched element 122 in a receiving slot 170 in the refill, as is the case when there is no toothbrush in the refill. In this position, the lower end penetrates 164 the filling needle 142 just like that through the opening 132 in the area 130 of the core element. The needle base 141 and the gasket set 144 are at their lowest position in the pump room 145 , A feather 174 in the pump room 145 has an endeavor to keep the needle base and the gasket set at their lowest position. The room inlet valve 176 at the bottom of the pump room 145 is in its closed (lowered) position as shown. The body of the needle 142 is by means of the seal 178 to the lower edge element 149 of the room 145 sealed off.
When the toothbrush by a user continues into the core element 110 is pushed in, the specially designed curved shoulders of the head portion of the toothbrush press against the wing members 126 . 128 at the base of the stretched element 122 ( 10 ). This will be the stretched element 122 pressed sufficiently far back, so that the approach 124 at the upper end of the stretched element from the receiving slot 170 moved out, whereby the core element in the refilling device can move upwards. More upward pressure on the toothbrush by the user has a further upward movement of the core element 110 entail the filling needle 142 wei through the opening 132 in the core element and in the refill valve 56 of (in 2 shown) header 14 the toothbrush penetrates.
12 shows a middle position during the movement of the core element, in which the top of the core element 110 to a shoulder area 180 the filling needle 142 encounters. To reach this center position, the core element in the refill has moved up, but neither the needle nor the seal set has moved 144 at which the base 141 the filling needle 142 is attached in the pump room 145 emotional. The inlet valve 176 stays closed.
In 13 the further upward movement of the toothbrush has a further upward movement of the core element 110 in the refill assembly with the core member facing up, against the shoulder area 180 the filling needle 142 pushes. The needle 142 , their base section 141 and the gasket set 144 move in the pump room 145 against the action of the spring 174 upwards, making between the needle base 141 and the lower end of the pump room 145 a volume 187 arises. Due to the negative pressure, liquid from the refill container through the upwardly moving inlet valve 176 in the volume 187 sucked. The volume 187 fills with fluid while the needle base 141 and the gasket set 144 in the pump room 145 against the action of the spring 174 move upwards.
The filling needle 142 points around its perimeter where it lies on the base area 141 meets, spaced openings. In particular, the needle 142 via a "crosshair structure" with the base area 141 connected, wherein the gap between the adjacent regions of the reticle structure is open to the hollow interior of the needle. When the core element reaches its highest position inside the refill assembly, the volume indicates 187 has a capacity of about 4 ml and is completely filled with liquid from the refill container 111 filled.
At this time, the brush head is pulled back a little. When the brush is pulled back, the spring penetrates 174 the gasket set 144 , the base area 141 the needle and the filling needle 142 even in the pump room 145 down, thereby increasing the volume 187 reduced. The liquid in the volume 187 passes through the reticle openings at the base of the filling needle down into the hollow interior of the filling needle 142 into, through and out of the opening 188 pushed out at the bottom of the needle.
At this time, as explained above, the opening is located 188 in the needle 142 inside the refill valve in the toothbrush. In the 4A and 4B the needle extends 142 down through an upper sealing element 189 in the valve 56 until about the lower end 190 , The valve 56 ensures in the area 193 for a seal around the needle 142 around, whereby the backflow of liquid from the needle through the outlet opening 194 attached to the fluid line 60 connects, is prevented. Out of the opening 188 liquid entering the needle moves through the opening 192 in the liquid line 52 ( 3 ) leading to the integrated container 50 leads.
The from the refill device into the container 50 In the illustrated embodiment, the amount of liquid moved is approximately 4 milliliters, which corresponds to the amount of liquid appropriate for a use unit. However, other quantities could be dispensed to the integrated container if desired, depending on the capacity of the container. When the toothbrush is pulled far enough out of the refill assembly, the needle, base area and seal set are as in 12 returned to its original position in the refill. The toothbrush is then removed from the refill and is ready for a single fluid application, ie, a single brushing operation. Refilling the integrated container 50 takes place before every cleaning process.
the illustrated embodiment
comprises only use unit, wherein the container is filled for each cleaning operation,
can the container
be modified so that liquid
as an application is ready. The external refill assembly
is still for
a comfortable refill
of the container of
Benefit as they use a relatively small liquid container in
which saves space and less demands on the pump
Consequently, a new liquid dispensing
and refill system
described. The system includes a small container for a use unit
in a removable head section of the toothbrush. From the container too
a small, in the brush head
located pump element, a liquid line extends.
When the brush head is moved back and forth, the pump element provides
Movement of the liquid
from the container
to a dispensing valve in the head of the toothbrush, through which the liquid
moved to the bristles.
The integrated container is refilled before each use with a separate refill device, in which the toothbrush is inserted. By the movement of the brush head relative to Refill device in a specific order moves liquid from the refill through a filling needle and the refill valve in the head of the toothbrush in the integrated container for a use unit.
One to the pump structure of 5 to 8th alternative embodiment is in the 15 to 20 shown. The complete pump, generally with 202 is partially in the base area 203 of the brush head 204 educated. There is also a cover element 214 Part of the complete pump 202 , Liquid, such as a dentifrice, is passed through an inlet port 206 to the pump 202 delivered. Part of the base 203 trained area of the pump 202 is a cylindrical pump bore 208 , In the pump bore is a movable spherical piston element 210 , which is also referred to as a piston ball.
At the exit end 226 the pump bore 208 there is a plug element 212 that in the pump hole 208 has a special design. From the exit end 226 the pump bore extends from a flat liquid outlet section 215 to a check valve 216 that directs fluid to the bristles. The alternative embodiment of 15 to 20 is generally more efficient and produces a higher pressure than the previously described embodiment.
As in particular in the 15 to 18 is shown, the inlet nozzle conveys 206 Liquid, such as a dentifrice, through the proximal end 219 of the brush head 204 to a short channel 220 in the brush head ( 16 ) is formed and the distal end 222 of the neck 206 with an inlet pipe 224 connects to the pump bore 208 at the inlet end 227 , In the illustrated embodiment, the inlet nozzle is located 224 at the upper end of the pump bore 208 ,
The pump bore 208 has in the illustrated embodiment a diameter which is slightly larger than the diameter of the spherical piston element 210 which is 2 mm in the illustrated embodiment. It is desirable that the diameter of the pump bore is only slightly larger than the diameter of the piston member 210 is to maintain the pressure in the pump bore and thus very little liquid passes the piston member when the piston member moves in the bore to pump liquid from the pump bore. In the illustrated embodiment, the pump bore has a diameter of about 2.1 mm and is about 4.5 mm long.
At the exit end 226 the pump bore 208 there is a plug 212 , The stopper 212 has a (the pump bore facing) inside 232 on, which is concavely curved, ie disc-shaped, as most clearly in 20 is shown. In the illustrated embodiment, the rounding is slightly greater than the curvature of the spherical piston element. In the illustrated embodiment, the plug is made of elastomeric material.
During its movement in the pump bore 208 the spherical piston element contacts the surface 232 at the end of the liquid delivery stroke, during which liquid is forced by the movement of the piston member from the inlet end of the pump bore to the discharge end. In the illustrated embodiment, the piston member is made of a tungsten carbide material. The higher density of tungsten carbide, for example, compared to steel, appears to increase the pressure and performance of the pump.
The power influencing pump sizes include the diameter of the spherical piston member, the cross-sectional area of the spherical piston and the weight of the spherical piston. The clearance between the piston member and the bore also affects performance. The fluid in the pump bore is through the outlet located at the top of the pump bore 234 pumped out ( 20 ).
From the pump bore 208 pumped out liquid moves directly into the liquid outlet section 215 which in the illustrated embodiment is about 0.635 cm (0.25 in) long by 0.254 in (0.10 in) wide and 0.0508 cm (0.02 in) high and in the brush head and bottom 214a of the cover 214 is defined. The cover element 214 extends from a point at the beginning of the channel 220 at the neck 206 to a point beyond the end 229 the liquid outlet channel 215 ,
In 19 indicates the area of the liquid exit section that passes through the bottom 214a the cover 214 is defined, two wing-like approaches 236 and 238 on, which extend from the lateral longitudinal edges of the liquid outlet channel to each other and narrow the outlet channel at this point. The two approaches 236 and 238 are generally triangular in shape and narrow the channel over a distance of approximately 0.2032 cm (0.08 inches) from a width of approximately 0.254 inches (0.10 inches) to a width of approximately 0.1016 cm (0.04 inches) Inch). While the two approaches 236 and 238 the out of the pump bore 208 pumped out liquid in the direction of the outlet opening in the brush head, they act as a liquid director, which opposes the liquid flow in the conveying direction less resistance than in the opposite direction. Beyond the approaches 236 and 238 there is a small element 240 , which is located centrally between the two sides of the outlet channel and from the bottom 214a the cover 214 hangs down in the outlet channel. The exit channel ends so that its sides are angled inwards and then meet in an arcuate area.
In the base area 203 of the brush head is directly under the element 240 a circular passage 244 whose diameter is approximately 0.10 inches in the illustrated embodiment. The passage 244 passes through the brush head and opens to the surface from which the bristles emerge. In the passage 244 is the exit check valve 216 arranged so that it extends between the bristles of the brush head surface away. In the illustrated embodiment, the check valve 216 in contrast to the duckbill design of the 5 to 8th a wedge-shaped construction. Overall, as stated above, the embodiment of the pump 15 to 20 generally more effective and produces better pressure than the previously disclosed pump.
a preferred embodiment of the invention has been disclosed herein for purposes of illustration;
it is understood that in this embodiment, various changes,
Modifications and substitutions can be incorporated without
to deviate from the invention, which by the claims such
follows is defined.
TEXT IN THE FIGURES